Disaster_Accident

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Sudanese armed forces ride in a military vehicle at the oil-rich border town of Heglig, Sudan, on Tuesday, April 24, 2012. (AP Photo/Abd Raouf)

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Claire Squires, 30, collapsed and died while running the London Marathon on Sunday. The cause of her death hasn't been determined. (Associated Press)

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Maryland Gov. Martin O'Malley speaks at the Special Committee on Homeland Security and Public Safety panel during the National Governors Association winter meeting in Washington, on Sunday, Feb. 26, 2012. ( AP Photo/Jose Luis Magana)

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ASSOCIATED PRESS PHOTOGRAPHS Actor Sean Penn (left) was in Haiti helping the displaced find shelter shortly after the massive 2010 earthquake that destroyed much of the country. He since has become a major figure in the effort to rebuild. Among his contributions is a clinic for women (above) at the Petionville Golf Club in Port-au-Prince set up by Mr. Penn's J/P Haitian Relief Organization.

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Mr. Penn, with Haitian President Michel Martelly, was named ambassador-at-large for Haiti in recognition of his humanitarian work since the earthquake. "My job is to help people get the future they want to have," Mr. Penn says.

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An Emergency Service Unit officer carries a chain saw into the basement of a building on the corner of Wooster Street and Prince Street in New York on Saturday during an investigation into the 1979 disappearance of 6-year-old Etan Patz. (Associated Press)

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On Sunday, April 22, 2012, relatives and other mourners in Karachi, Pakistan, carry the coffins of a couple who were killed in the crash of a Bhoja Air Boeing 737 on the outskirts of Islamabad on Friday. All 127 people on board died. (AP Photo)

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**FILE** New homes are seen March 23, 2012, under construction in a development in Atlanta. (Associated Press)

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D.R. Horton is building 29 single-family homes on 7,000-square-foot sites at Sherwood Forest in Haymarket. The Yorktown model, with 2,212 square feet, is priced from $359,990.

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A month after Haiti's January 2010 earthquake, Angelina Jolie visits at MSF Hospital in Port-au-Prince with a 10-year-old boy who lost a leg in the quake. The actress is a United Nations special envoy for refugees. (United Nations High Commissioner for Refugees via Associated Press)

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"Timmy" the monkey joined the Think Geek crew as they watched the space shuttle Discovery fly past the Smithsonian Air and Space Museum's Udvar-Hazy Center in Chantilly, Va., on Tuesday, April 17, 2012. Timmy has been to at least five shuttle launches. (Barbara L. Salisbury/The Washington Times)

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The NASA Space Shuttle Discovery is seen being carried piggyback on a modified Boeing 747, above the Washington Monument in Washington, D.C., Tuesday, April 17, 2012, as it makes it's way to the Steven F. Udvar-Hazy Center in Chantilly, Va. (Rod Lamkey Jr/The Washington Times)

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The NASA Space Shuttle Discovery is seen being carried piggyback on a modified Boeing 747, above the Washington Monument in Washington, D.C., Tuesday, April 17, 2012, as it makes it's way to the Steven F. Udvar-Hazy Center in Chantilly, Va. (Rod Lamkey Jr/The Washington Times)